http://www.the-jmcc.org/amethyst-sphere/
What is the cut called for a dome shaped stone with only 1 facet (bottom)?
I don't know what this cut is called. I just saw an amethyst ring that was just a smooth dome. It looked like a perfectly smooth sphere but cut in half with the flat part down and the smooth dome facing up. I looked up "dome cut" but that's a faceted dome, not a smooth one. I remember hearing it called a "cabochet" or something like that once, but I can't remember.
It's called a cabochon (also spelled cabachon). See source.
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